Cosmetic compositions for improving the performance of transfer-resistant and long-wearing

The present invention relates to a cosmetic composition, and, more particularly, to a cosmetic composition which has transfer-resistance, excellent long-wearing characteristics, and excellent covering and sebum controlling power, and that minimizes skin strain.

In cosmetic compositions, a water-in-oil type emulsion is widely used as a typical formulation that includes oil phase, water phase, an emulsifier, and pigments, and that has an intermediate viscosity between a cream and a lotion. However, the water-in-oil emulsion formulation is disadvantageous for at least the following reasons: it is easily transferred after being applied on the skin, it is easily wiped away by water, particularly due to the use of a water-soluble ingredient for forming a film, and it has low long-wearing characteristics.

In the case of a solid phase cosmetic material produced from powder ingredients only, although excellent wear comfort is provided, such a solid phase cosmetic material is disadvantageous because powder is easily dispersed during application. Further, the solid phase cosmetic material is broken easily, and provides for low long-wearing characteristics.

A cosmetic material was suggested that has powder ingredients dispersed in oil phase. However, in this case, although the cosmetic material has excellent water-resistance and long-wearing characteristics, the wear comfort thereof may be described as being heavy and skin strain occurs due to the formation of a thick cosmetic film.

In order to solve the problems of the prior art described hereinabove, the present invention provides a cosmetic composition which has transfer-resistance, excellent long-wearing characteristics, and excellent covering and sebum controlling power, and that minimizes skin strain.

Also, the present invention provides a manufacturing method for the cosmetic composition that includes a mixing process which homogeneously mixes an oil phase ingredient and a powder ingredient with a mixer and a multi-step roller, adding volatile oil to the mixture, and controlling viscosity.

In order to achieve the advantages described hereinabove, the present invention provides a cosmetic composition including: 40-90% by weight of an oil phase ingredient including 5-40 parts by weight of trimethylsiloxysilicate, 5-70 parts by weight of volatile oil, 0.1-5 parts by weight of dimethicone/vinyl-dimethicone crosspolymer; and 10-60% by weight of a powder ingredient including 0.5-40 parts by weight of organic hectorite, 0.5-5 parts by weight of methyl methacrylate crosspolymer, and 0.5-50 parts by weight of pulverulent body.

Also, the present invention provides a manufacturing method for the cosmetic composition including: (i) with a mixer and a multi-step roller, homogeneously mixing a) oil phase ingredients including trimethylsiloxysilicate, volatile oil, and dimethicone/vinyl-dimethicone crosspolymer, and b) powder ingredients including organic hectorite, methyl methacrylate crosspolymer, and pulverulent body; (ii) adding volatile oil to the mixture of process (i), dispersing homogeneously, and controlling viscosity.

The present invention will now be described in detail.

While researching cosmetic compositions, the inventors of the present invention found that if trimethylsiloxysilicate and dimethicone/vinyl-dimethicone crosspolymer in volatile oil were added as oil phase ingredients, the trimethylsiloxysilicate may adhere powder ingredients to the skin to thereby obtain transfer-resistance and long-wearing characteristics, and the dimethicone/vinyl-dimethicone crosspolymer may reduce skin strain. Based on these findings described hereinabove, the present invention may be accomplished.

While a water-in-oil emulsion formulation typically includes oil phase, water phase, an emulsifier, and powder (such as a pigment), a cosmetic composition of the present invention includes oil phase and powder phase, thereby obtaining a sludge formulation. The sludge formulation is such that the oil and powder phases are separated in a static state, and homogeneously mixed and remaining so for about 5 minutes when shaken prior to application. The sludge formulation is subsequently separated again after the elapse of this approximately 5-minute interval.

The cosmetic composition of the present invention does not include an emulsifier to thereby achieve reduced stickiness, wear comfort that may be described as being light when applied on the skin, and excellent water-resistance due to the fact that water phase is not included. When a cosmetic composition is mixed with a large amount of powder phase, the water-in-oil emulsion deteriorates the stability of a composition and coatibility such that uneven makeup application occurs. The cosmetic composition of the present invention, however, has the sludge formulation which may be mixed with a large amount of powder, thereby providing excellent covering and even coating.

According to the present invention, the cosmetic composition includes: a) 40-90% by weight of oil phase ingredients including 5-40 parts by weight of trimethylsiloxysilicate, 5-70 parts by weight of volatile oil, and 0.1-5 parts by weight of dimethicone/vinyl-dimethicone crosspolymer; and b) 10-60% by weight of powder ingredients including 0.5-40 parts by weight of organic hectorite, 0.5-5 parts by weight of methyl methacrylate crosspolymer, and 0.5-50 parts by weight of pulverulent body.

In the oil phase ingredients, the trimethylsiloxysilicate is an ingredient that forms a film on skin, which enables the powder ingredients to be adhered on the skin and to have transfer-resistance.

The cosmetic composition of the present invention has the oil phase trimethylsiloxysilicate added as a film-forming ingredient to thereby exhibit less transfer compared to a conventional water-in-oil emulsion formulation that uses water-soluble ingredients for the film forming. Hence, the present invention is not wiped away easily by water, and provides for excellent long-wearing characteristics.

Among the oil phase ingredients, the volatile oil is a solvent for mixing/dispersing the composition homogeneously and enhancing the coatibility of the composition. A content of the volatile oil may be determined by considering the desired dispersion and the coatibility enhancing effect of the composition.

The volatile oil may be selected from the group consisting of cyclopentasiloxane, methicone, dimethicone, C8-20 isoparaffin, propylene carbonate, polydecene, liquid paraffin, and a combination thereof.